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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f5f602d53fbf713e755b4c8dc5297bd84cd02dfc24494191d5a254a679313b' 
  AND token = '7uDxvSS6ZD38BB4et+Ouh62Oy8kXUwdJA71T4pruYjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}